Kettle base



FIG. 1 is a front perspective view of a kettle base showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines in the drawings and the areas within them depict portions of the kettle base that form no part of the claimed design. 

CLAIM The ornamental design for a kettle base, as shown and described. 